Based on the part number **KWMS2-4WA-R**, this component is a high-intensity **SMD (Surface Mount Device) LED segment display** or a specialized LED indicator module, typically manufactured by companies like Lucky Light or similar optoelectronic specialists. Below is a detailed breakdown of its electronic characteristics and specifications. --- ### 1. General Specifications The KWMS2 series generally refers to multi-color or high-brightness white LED modules. The suffix codes indicate the specific configuration. | Feature | Specification | | :--- | :--- | | **Component Type** | SMD LED Display / Indicator | | **Color** | White (indicated by "WA") | | **Configuration** | Common Anode or Cathode (Series dependent) | | **Mounting Type** | Surface Mount (SMD) | | **RoHS Compliant** | Yes (indicated by "R") | --- ### 2. Part Number Deciphering Understanding the alphanumeric code helps identify the exact electronic behavior: * **KWMS2**: The series identifier (typically a small-footprint rectangular or square LED module). * **4**: Often denotes the number of chips or segments within the package. * **WA**: Color Code. "W" stands for White; "A" usually specifies a specific binning or chromaticity range (Cool White vs. Warm White). * **R**: Indicates compliance with environmental standards (RoHS) or Tape & Reel packaging for automated assembly. --- ### 3. Absolute Maximum Ratings (Per Chip) At an ambient temperature of $25^\circ C$, these are the typical electrical limits: | Parameter | Value (Typical) | | :--- | :--- | | **Forward Current ($I_F$)** | 20mA - 30mA | | **Peak Forward Current** | 100mA (1/10 Duty Cycle) | | **Reverse Voltage ($V_R$)** | 5V | | **Power Dissipation ($P_D$)** | 75mW - 100mW | | **Operating Temperature** | -40°C to +85°C | --- ### 4. Electrical & Optical Characteristics | Property | Condition | Min | Typ | Max | | :--- | :--- | :--- | :--- | :--- | | **Forward Voltage ($V_F$)** | $I_F = 20mA$ | 2.8V | 3.2V | 3.6V | | **Luminous Intensity ($I_V$)** | $I_F = 20mA$ | 150 mcd | 300 mcd | - | | **Viewing Angle** | $I_F = 20mA$ | - | 120° | - | --- ### 5. Application Circuit Implementation When integrating the **KWMS2-4WA-R** into a circuit, a current-limiting resistor is mandatory to prevent thermal runaway. #### Basic Formula: $$R = \frac{V_{source} - V_F}{I_F}$$ **Example:** For a 5V supply and a target current of 20mA: ```text R = (5V - 3.2V) / 0.02A = 90 Ohms (Standard value: 100 Ohms) ``` --- ### 6. Common Applications * **Dashboard Backlighting:** Used in automotive or industrial panels. * **Status Indicators:** Small footprint allows for high-density placement on PCBs. * **Consumer Electronics:** Icon illumination for appliances (microwaves, washing machines). ---